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Appendix E - Guide to Quality Assessment and Data Extraction

Introduction

Quality Assessment

These forms aim to i) extract data with multiple choice questions to allow simple characterization of the group of studies ii) extract data with open- ended questions to allow the generation of detailed evidence table(s) and iii) appraise the quality of the data in terms of its internal validity. 33

  • 1.

    What type of OHSMS intervention is being studied?

    • Mandatory OHSMS interventions are those where the OHSMS is required by law. Voluntary OHSMS interventions include those available from commercial sources and government sources, providing their adoption is voluntary.

  • 2.

    How many work sites comprise the study sample?

    • For this question, report on the number of workplaces observed at the start of the study. (A larger sample might have been drawn, and a smaller sample decided to participate. For this question, indicate the latter number).

    • If the facilitators and barriers (F/B) portion of a study is different than the implementation/effectiveness (I/E) portion of the study regarding the sample size, then answer the multiple choice question with the I/E study in mind and note any differences for the F/B study in the text box. If this isn’t noted, the assumption will be that the samples are the same.

  • 3.

    Of what size of enterprise was the study sample representative?

    • The cutoff between medium and large varies among jurisdictions and sectors; go by the authors’ definition

    • If the facilitators and barriers (F/B) portion of a study is different than the implementation/effectiveness (I/E) portion of the study regarding the sample size, then answer the multiple choice question with the I/E study in mind and note any differences for the F/B study

33 Internal validity: “The index and comparison groups are selected and compared in such a manner that the observed differences between them on the dependent variables under study may, apart from sampling error, be attributed only to the hypothesized effect under investigation.” This definition and others used later are taken from Last JM (ed.) A Dictionary of Epidemiology, 4th ed., 2001.

Effectiveness of Occupational Health & Safety Management Systems: A Systematic Review

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